5666023661 has 2 divisors, whose sum is σ = 5666023662. Its totient is φ = 5666023660.

The previous prime is 5666023651. The next prime is 5666023673. The reversal of 5666023661 is 1663206665.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2876176900 + 2789846761 = 53630^2 + 52819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5666023661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5666023651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2833011830 + 2833011831.

It is an arithmetic number, because the mean of its divisors is an integer number (2833011831).

Almost surely, 2^5666023661 is an apocalyptic number.

It is an amenable number.

5666023661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5666023661 is an equidigital number, since it uses as much as digits as its factorization.

5666023661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 41.

The square root of 5666023661 is about 75272.9942343202. The cubic root of 5666023661 is about 1782.7596444556.

The spelling of 5666023661 in words is "five billion, six hundred sixty-six million, twenty-three thousand, six hundred sixty-one".